What is the religious ruling regarding the crime of raping a child and killing her by throwing her from the eleventh floor, committed by two 17-year-old juveniles?

This heinous act combined the crimes of murder and rape. The murder here is intentional, deserving of retribution (qisas), even if the victim was a child. The perpetrator's collusion in the murder necessitates qisas. As for rape or forced adultery, if the child is old enough for intercourse, then the prescribed punishment (hadd) is due for whoever is proven to have committed adultery with her; otherwise, not. The ultimate decision on this rests with the Islamic judge (Sharia judge), and qisas and hudud punishments may not be carried out except with the permission of the ruler.